他向后看了一眼，确认没有人跟踪他。

He took a ___backward look to make sure no one was following him.

这个村庄的教育设施相当落后，急需改善。

The village's ___backward educational facilities urgently need improvement.

她太害羞了，不敢和陌生人交谈。

She is too ___backward to start a conversation with strangers.

她倒着念出了字母表。

She recited the alphabet ___backward.